yerful,
Sorry that you are seeing this issue with CodeMix.
Is this a new install of CodeMix? Please try deleting the .codemix\engine folder in your home directory and then restarting Eclipse (note that the folder name begins with a dot, which is hidden by default in the file explorer). This will re-extract the engine, in case there has been some corruption of the code.
If you are still seeing the problem, then please share with us the workspace log located at workspace dir/.metadata/.log (save it as .txt file and attach it) for further investigation?
You can also reach us on Live Chat for quick help and connect with one of our CodeMix developers—select Help>CodeMix>Live Chat. We will run some diagnostic tools to figure out the issue.
Apologies for inconvenience caused.
–Swapna
Genuitec Support